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I just replace my old electric shower with a new one of a similar rating. The shower installation manual mentioned nothing about earthing the shower unit to the suppling pipe work, and there is only one earth terminal which is being used by the mains in. Do I need to earth it to this pipe work?

I have a concrete fence post which has fractured at the point just before it enters the ground it now wobbles on the internal metal rods. The post is about 4 inchs square, about 5ft 5in high and has 4 metal rods running through it and in conjunction with other posts holds ordinary wood fence...